<template>
  <div class="component-upload-image">
    <el-upload
      multiple
      :action="uploadImgUrl"
      list-type="picture-card"
      :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      name="file"
      :on-remove="handleRemove"
      :show-file-list="true"
      :headers="headers"
      :file-list="fileList"
      :on-preview="handlePictureCardPreview"
      class="image-upload "
      :class="{hide: this.fileList.length >= this.limit}"
      :disabled="true"
    >
      <div slot="file" slot-scope="{file}" class="file-options">
        <img
          class="el-upload-list__item-thumbnail"
          :src="file.url"
          alt=""
        >
        <span class="el-upload-list__item-actions">
          <span
            v-if="showTip"
            class="el-upload-list__item-preview"
            @click="handleSelectFile"
          >
            <i class="el-icon-upload2" />
          </span>
          <span
            class="el-upload-list__item-preview"
            @click="handlePictureCardPreview(file)"
          >
            <i class="el-icon-zoom-in"></i>
          </span>
          <span
            v-if="showTip"
            class="el-upload-list__item-delete"
            @click="handleRemove(file)"
          >
            <i class="el-icon-delete"></i>
          </span>
        </span>
      </div>
      <div v-if="fileList.length === 0">
        <span class="el-upload-list__item-actions">
           <span
             v-if="showTip"
             class="el-upload-list__item-preview"
             @click="handleSelectFile"
           >
          <i class="el-icon-upload2" />
        </span>
        </span>
      </div>
    </el-upload>
    <!-- 预览  -->
    <el-dialog
      :visible.sync="dialogVisible"
      title="预览"
      append-to-body
      v-drag-zoom
    >
      <img
        :src="dialogImageUrl"
        style="display: block; max-width: 100%; margin: 0 auto"
       alt=""/>
    </el-dialog>
    <!-- 文件管理  -->
    <file-select :visible.sync="showFileSelect" v-if="showFileSelect" :file-ext-name="fileType" :file-size="fileSize" @setFileUrl="setImageUrl"/>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";
import FileSelect from "@/components/FileSelect/index.vue";

export default {
  components: { FileSelect },
  props: {
    value: {
      type: [String, Object, Array],
      default: null
    },
    // 图片数量限制
    limit: {
      type: Number,
      default: 5,
    },
    // 大小限制(MB)
    fileSize: {
       type: Number,
      default: 10,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ["png", "jpg", "jpeg", 'blob'],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true
    },
    // 上传到的文件夹
    filePath: {
      type: String,
      default: '/blog/blog-image'
    },
    // 要素编码
    elementCode: {
      type: String,
      default: null
    },
  },
  data() {
    return {
      number: 0,
      uploadList: [],
      dialogImageUrl: "",
      dialogVisible: false,
      hideUpload: false,
      uploadImgUrl: process.env.VUE_APP_BASE_API + "/file/file/upload?path=" + this.filePath, // 上传的图片服务器地址
      headers: {
        Authorization: "Bearer " + getToken(),
      },
      fileList: [],
      showFileSelect: false
    };
  },
  watch: {
    value: {
      handler(val) {
        if (val) {
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : this.value.split(',');
          // 然后将数组转为对象数组
          this.fileList = list.map(item => {
            if (typeof item === "string") {
              item = { name: item, url: item };
            }
            return item;
          });
        } else {
          this.fileList = [];
          return [];
        }
      },
      deep: true,
      immediate: true
    }
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  methods: {
    // 删除图片
    handleRemove(file, fileList) {
      const findex = this.fileList.map(f => f.name).indexOf(file.name);
      if(findex > -1) {
        this.fileList.splice(findex, 1);
        this.$emit("setImageUrl", this.listToString(this.fileList));

      }
    },
    // 上传成功回调
    handleUploadSuccess(res) {

      const code = res.code;
      const msg = res.msg;
      if (code === 401) {
        MessageBox.confirm('登录状态已过期，您可以继续留在该页面，或重新登录', '系统提示', {
              confirmButtonText: '重新登录',
              cancelButtonText: '取消',
              type: 'warning'
            }
        ).then(() => {
          store.dispatch('LogOut').then(() => {
            location.href = '/index';
          })
        })
      } else if (code === 500) {
        Message({
          message: msg,
          type: 'error'
        })
      } else if (code !== 200) {
        Notification.error({
          title: msg
        })
      } else {
        this.uploadList.push({ name: res.data.url, url: res.data.url });
        if (this.uploadList.length === this.number) {
          this.fileList = this.fileList.concat(this.uploadList);
          this.uploadList = [];
          this.number = 0;
          this.$emit("setImageUrl", this.listToString(this.fileList));
        }
      }
      this.$modal.closeLoading();
    },
    // 上传前loading加载
    handleBeforeUpload(file) {
      let isImg = false;
      if (this.fileType.length) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        isImg = this.fileType.some(type => {
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
      } else {
        isImg = file.type.indexOf("image") > -1;
      }

      if (!isImg) {
        this.$modal.msgError(`文件格式不正确, 请上传${this.fileType.join("/")}图片格式文件!`);
        return false;
      }
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$modal.msgError(`上传头像图片大小不能超过 ${this.fileSize} MB!`);
          return false;
        }
      }
      this.$modal.loading("正在上传图片，请稍候...");
      this.number++;
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`);
    },
    // 上传失败
    handleUploadError() {
      this.$modal.msgError("上传图片失败，请重试");
      this.$modal.closeLoading();
    },
    // 预览
    handlePictureCardPreview(file) {
      this.dialogImageUrl = file.url;
      this.dialogVisible = true;
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        strs += list[i].url + separator;
      }
      return strs != '' ? strs.substr(0, strs.length - 1) : '';
    },
    handleSelectFile() {
      this.showFileSelect = true
    },
    setImageUrl(url) {
      if (this.elementCode === null) {
        this.$emit("setImageUrl", url);
      } else {
        this.$emit("setImageUrl", this.elementCode, url);
      }
      this.showFileSelect = false
    }
  }
};
</script>
<style scoped lang="scss">
::v-deep.hide {
  .el-upload--picture-card {
    display: none;
    width: 125px !important;
    height: 125px !important;
  }
  .el-upload-list__item {
    margin: 0 !important;
  }
  .el-upload__tip {
    margin-top: 0 !important;
  }
  .el-upload-list__item {
    width: 117px !important;
    height: 117px !important;
  }
}
// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
    transition: all 0s;
}

::v-deep .el-list-enter, .el-list-leave-active {
    opacity: 0;
    transform: translateY(0);
}
.file-options {
  height: 100%;
  img {
    width: unset !important;
    height: 100%;
  }
}
::v-deep.image-upload {
  .el-upload--picture-card {
    width: 125px !important;
    height: 125px !important;
  }
}
</style>

